CN101541117B - Electronic device with function of LED illumination control and control method thereof - Google Patents
Electronic device with function of LED illumination control and control method thereof Download PDFInfo
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- CN101541117B CN101541117B CN2008100661564A CN200810066156A CN101541117B CN 101541117 B CN101541117 B CN 101541117B CN 2008100661564 A CN2008100661564 A CN 2008100661564A CN 200810066156 A CN200810066156 A CN 200810066156A CN 101541117 B CN101541117 B CN 101541117B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005286 illumination Methods 0.000 title abstract 10
- 239000011159 matrix material Substances 0.000 claims abstract description 49
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 13
- 238000009434 installation Methods 0.000 claims description 46
- 230000005669 field effect Effects 0.000 claims description 32
- 230000005611 electricity Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 11
- 239000003990 capacitor Substances 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention provides an electronic device with the function of LED illumination control, which comprises a signal generation unit, a microcontroller, and an impulse current control unit and an LED matrix, wherein the signal generation unit is used for generating a using signal; when the re-utilization of the electronic device is detected, the recorded unused time is equal to or exceeds the preset unused time, and the microcontroller is used for outputting a super illumination control signal according to a normal brightness control signal output by the using signal; the impulse current control unit is used for controlling output current according to the normal illumination control signal and the super illumination control signal; and the LED matrix is used for superbright illumination, when the output time of the super illumination control signal is equal to the preset output time of the super illumination control signal, the output of the super illumination control signal is stopped, and the LED matrix illuminates normally. The invention also provides a control method for the illumination of the electronic device.
Description
Technical field
The present invention relates to a kind of electronic installation and control method of the LED of having brilliance control function, relate in particular to electronic installation and the control method of a kind of LED of control superbright degree work.
Background technology
Along with the development of LED-backlit technology, the display screen of increasing electronic product adopts the LED matrix as backlight.Yet the LED of present display screen can only regulate its brightness in certain brightness range, i.e. the brightness of LED matrix can only be in nominal brightness with interior adjusting.But in some specific occasions, during for example as product introduction, the superbright degree is luminous at short notice makes the highlighted demonstration of display screen for induction user's use signal, the LED matrix that needs display screen, to attract user's attention.
Open day is on October 10th, 2007, and publication number is that the Chinese patent of CN101052254 has disclosed the luminous method of a kind of driving LED and LED light emission drive circuit.This circuit comprises: a frequency generator, a pulse current control module, a pulse current detecting unit, a reference current unit and a comparer.Can produce the pulse electric current that exceed the quata according to certain dutycycle is the LED matrix power, make LED at interval, the superbright degree is luminous.So, this circuit makes the LED matrix current work that exceeds the quata all the time to decide, the serviceable life that can reduce LED to a certain extent.Based on above problem, be necessary to invent a kind of electronic installation of the LED of having brilliance control function, the superbright degree is luminous at short notice to make the LED matrix of display screen, and does not influence its serviceable life.
Summary of the invention
Primary and foremost purpose of the present invention is to provide a kind of electronic installation of the LED of having brilliance control function, and it can control the LED matrix, and the superbright degree is luminous at short notice.
A further object of the present invention is to provide a kind of electronic installation of the LED of having brilliance control function, its LED matrix that can control display screen luminous number of times of superbright degree in the short time in setting-up time.
Described electronic installation comprises: a power supply, for the electric energy that described electronic installation work is provided; One signal generation unit uses signal for generation of one; One microcontroller is used for output one normal brightness control signal; One pulse current control module is used for the electric current according to described normal brightness control signal control output; One LED matrix is used for luminous according to described electric current normal brightness; And a display unit, for the content that shows described electronic installation.Described microcontroller also comprises a timer, described microcontroller produces one and exports a superbright degree control signal when using signal to export described normal brightness control signal receiving the signal generation unit, described pulse current control module makes that according to described normal brightness control signal and described superbright degree control signal control output current this LED matrix superbright degree is luminous; This microcontroller is also by the described superbright degree of this timer timing control signal output time, when described superbright degree control signal output time reaches default superbright degree control signal output time, described microcontroller stops to export described superbright degree control signal, continues the described normal brightness control signal of output.
The described microcontroller of described electronic installation of the present invention also continues not receive the unused time of the use signal that the signal generation unit produces by described timer record.When the unused time of described record equaled or exceeded a default unused time when described microcontroller received described use signal, export a superbright degree control signal when exporting described normal brightness control signal, when described superbright degree control signal output time reaches default superbright degree control signal output time, described microcontroller stops to export described superbright degree control signal, continues the described normal brightness control signal of output.
The microcontroller of described electronic installation of the present invention further includes a counter, and microcontroller is by the number of times of described superbright degree control signal output in this rolling counters forward setting-up time.Accordingly, storer is also stored the default output number of times of superbright degree control signal in the setting-up time.When described microcontroller is exported described superbright degree control signal at need, judge that whether the number of times of described superbright degree control signal output in the setting-up time is greater than default output number of times, when the number of times of described superbright degree control signal output in setting-up time output superbright degree control signal during less than default output number of times, it is luminous to control this LED matrix superbright degree, otherwise does not export described superbright degree control signal.
Another object of the present invention is to provide a kind of brightness control method of electronic installation, it can control the LED matrix, and the superbright degree is luminous at short notice.Described method comprises:
Judge whether to detect one and use signal;
Whether the unused time of judging record reaches default unused time;
Export a normal brightness control signal and a superbright degree control signal, and the output time of the described superbright degree of timing control signal; And
Judge whether superbright degree control signal output time reaches default superbright degree control signal output time; If reach default output time, then stop to export superbright degree control signal, but continue output normal brightness control signal; If do not reach default output time, then continue the described normal brightness control signal of output and superbright degree control signal.
Described method further comprises step:
Judge whether described superbright degree control signal output number of times reaches default output number of times in the setting-up time, if reach default output number of times, then exports described normal brightness control signal; If do not reach default output number of times, then export described normal brightness control signal and described superbright degree control signal.
Described electronic installation and control method with LED brilliance control function, when detecting the use signal, the superbright degree is luminous in the control electronic installation certain hour, and control luminous number of times of superbright degree in Preset Time, thereby does not influence the serviceable life of electronic installation.
Description of drawings
Fig. 1 has the circuit block diagram of first embodiment of the electronic installation of LED brilliance control function for the present invention.
Fig. 2 is pulse current control module shown in Figure 1 and the circuit diagram of LED matrix.
Fig. 3 is the brilliance control process flow diagram of electronic installation shown in Figure 1.
Fig. 4 has the circuit block diagram of second embodiment of the electronic installation of LED brilliance control function for the present invention.
Fig. 5 is the brilliance control process flow diagram of electronic installation shown in Figure 4.
Embodiment
Fig. 1 has the circuit block diagram of first embodiment of the electronic installation (hereinafter to be referred as " electronic installation ") of LED brilliance control function for the present invention.Described electronic installation 100 can be electronic products such as digital photo frame, portable computer.Described electronic installation 100 comprises: a power supply 1 is used for providing described electronic installation 100 required electric energy; One signal generation unit 2, use signal for generation of one, signal generation unit 2 of the present invention comprises power switch, various input media, various interface and various sensors etc., and described use signal comprises accordingly: the input signal of starting-up signal, various input medias, Interface status variable signal and the detected signal of sensor etc.; One microcontroller 3 is used for output one normal brightness control signal BL; One pulse current control module 4 is used for according to described normal brightness control signal BL control output current; One LED matrix 6 is used for producing normal brightness according to described output current; One display screen 7 is used for showing the content of described electronic installation when described LED matrix 6 is luminous.
This microcontroller 3 includes a timer 31, this microcontroller 3 continues not receive the time (hereinafter referred to as unused time) of the use signal of signal generation unit 2 generations by this timer 31 records, described this microcontroller 3 also is connected with a storer 5, and this storer 5 is used for storage one default superbright degree control signal output time and a default unused time.Described microcontroller 3 also one uses signal what receiving that signal generation unit 2 produces, and the unused time that records is when equaling or exceeding default unused time, output superbright degree control signal HL when exporting described normal brightness control signal BL.Described pulse current control module 4 makes that according to described normal brightness control signal BL and described superbright degree control signal HL control output current these LED matrix 6 superbright degree are luminous.This microcontroller 3 is also by the described superbright degree control signal HL output time of these timer 31 records, when described superbright degree control signal HL output time reaches this default superbright degree control signal output time, described microcontroller 3 stops to export described superbright degree control signal HL, but continue the described normal brightness control signal BL of output, described pulse current control module 4 makes that according to described normal brightness control signal BL control output current described LED matrix 6 is normally luminous.
In addition, for reaching the power saving purpose, after continuing described normal brightness control signal BL one Preset Time of output, can make described electronic installation 100 enter a sleep pattern, stop the output of described normal brightness control signal BL.Described electronic installation 100 is at the non-emphasis of the present invention of the working method that enters sleep pattern, so be not described in detail.
Fig. 2 is pulse current control module 4 shown in Figure 1 and the circuit diagram of LED matrix 6.Described pulse current control module 4 comprises one first switch element 41, controlledly is formed on described normal brightness control signal BL and conducting or end, thereby controls the voltage of described first switch element 41 outputs; One DC-DC voltage boosting translation circuit 42 is used for described power supply 1 via the voltage transformation of described first switch element 41 outputs for driving the required voltage of described LED matrix 6; One second switch unit 43 controlledly is formed on described superbright degree control signal HL and conducting or end.When 43 conductings of described second switch unit, control the feedback resistance R9 parallel connection that one first resistance R 8 is connected with described LED matrix 6, then the current feedback resistance of LED matrix 6 diminishes, and makes the electric current of the LED matrix 6 of flowing through become big, and LED matrix 6 superbright degree are luminous.
Described first switch element 41 comprises: a P-channel enhancement type field effect transistor Q1 (being called for short " field effect transistor Q1 " down), a triode Q2, a capacitor C 2 and a plurality of resistance R 1, R2, R3 and R4.Described field effect transistor Q1 is electrically connected on a working power VCC via an inductance FB1.One filter capacitor C1 is electrically connected between the source S and power supply ground of described field effect transistor Q1.Be connected between the source S and grid G of described field effect transistor Q1 after described resistance R 1 and described capacitor C 2 are in parallel, and be electrically connected on the collector C of described triode Q2 through described resistance R 2.The emitter E of described triode Q2 is electrically connected on power supply ground, and grid G is connected in described emitter E via described resistance R 4.The grid G that described normal brightness control signal BL is sent to described triode Q2 via described resistance R 3 is controlled the conducting of described triode Q2 and is ended.When described triode Q2 conducting, the voltage of the grid G of described field effect transistor Q1 reduces, and makes the gate source voltage reverse bias of described field effect transistor Q1, described field effect transistor Q1 conducting.
Described DC-DC voltage boosting translation circuit 42 comprises: a DC-DC voltage boosting converter U1, an inductance L 1, a resistance R 5, a capacitor C 4 and a rectifier D1.Described DC-DC voltage boosting converter U1 (abbreviate down " transducer U1 ") is used for described power supply 1 via the voltage transformation of described field effect transistor Q1 output for driving the required voltage of described LED matrix 6.One capacitor C 3 and an electrochemical capacitor EC1 are electrically connected on input end and the output terminal of described transducer U1 respectively, are respectively applied to import filtering and output filtering.Described transducer U1 comprises: an operating voltage end VIN and an Enable Pin EN are electrically connected on the drain D of described field effect transistor Q1, and described Enable Pin EN is electrically connected on ground through described resistance R 5.Described transducer U1 further comprises power supply ground end GND, a power switch output terminal SW, an overvoltage protection end OVP and a feedback input end FB.Described power supply ground end GND is electrically connected on ground.Described power switch output terminal SW is connected in described inductance L 1 and described rectifier D1 positive pole, and is electrically connected on ground via described capacitor C 4.The other end of described inductance L 1 is electrically connected on the operating voltage end VIN of described transducer U1.The negative electricity of described rectifier D1 is connected in the input end of described LED matrix 6.Described overvoltage protection end OVP is electrically connected on the negative pole of described rectifier D1, and the output voltage of clamper transducer U1.The output terminal of described LED matrix 6 is electrically connected on ground through described feedback resistance R9.The feedback input end FB of described transformer U1 is electrically connected between the output terminal and described feedback resistance R9 of described LED matrix 6, is used for regulating the electric current of described LED matrix 6.
When the described normal brightness control signal BL of described microcontroller 3 outputs is high level and/or a pwm signal, control described triode Q2 conducting.When described triode Q2 conducting, high level signal and/or a pwm signal synchronous with normal brightness control signal BL also exported in described field effect transistor Q1 conducting.The Enable Pin EN of described transducer U1 controls described transducer U1 via described SW end output one voltage according to described high level signal and/or pwm signal.Described voltage is luminous through the described LED matrix of described rectifier D1 rectification rear drive.When if normal brightness control signal BL is a pwm signal, change the dutycycle of described pwm signal, can adjust the magnitude of voltage of transducer U1 output, thereby adjust the brightness of described LED matrix.For example, increase the dutycycle of described pwm signal gradually, then the magnitude of voltage of transducer U1 output increases gradually, and then the brightness of LED matrix is enhanced to nominal brightness gradually.
Described second switch unit 43 comprises: a N channel enhancement field effect transistor Q3, a plurality of resistance R 6, R7.The grid of described N channel enhancement field effect transistor Q3 (being called for short " field effect transistor Q3 " down) is electrically connected on ground via described resistance R 7, the source electrode of described field effect transistor Q3 is electrically connected on ground, and the drain electrode of described field effect transistor Q3 is electrically connected between the output terminal and described feedback resistance R9 of described LED matrix through described first resistance R 8.The grid of described field effect transistor Q3 receives the described superbright degree control signal HL of described microcontroller 3 outputs via described resistance R 6, and controls the conducting of described field effect transistor Q3 and end according to described superbright degree control signal HL.
When described field effect transistor Q3 ended, the branch road at described first resistance R 8 places disconnected with described feedback input end FB and resistance R 9 and being connected, and the resistance of the feedback resistance of described feedback input end FB input is R9; When described field effect transistor Q3 conducting, described first resistance R 8 and described feedback resistance R9 are parallel between described LED matrix 6 output terminals and the ground, then the resistance of the feedback resistance of described feedback input end FB input is described feedback resistance R9 and the resistance in parallel of described first resistance R 8, the resistance of the feedback resistance of described feedback input end FB input diminishes, and then increases the electric current of described LED matrix 6.The electric current of LED matrix 6 increases owing to flow through, so LED matrix 6 superbright degree are luminous.
See also Fig. 3.Fig. 3 is the brilliance control process flow diagram of electronic installation 100 shown in Figure 1.Microcontroller 3 detects when using signal, uses the brightness of signal controlling LED matrix 6 according to this.Control method comprises: step S21: judge whether to detect one and use signal; If do not detect the use signal, then continue to detect and use signal; Use signal if detect one, then enter step S22: whether the unused time of judging record reaches default unused time, if do not reach default unused time, then enters step S26: output normal brightness control signal; If reach default unused time, then enter step S23: export the output time that a normal brightness control signal and a superbright degree control signal to pulse current control module 4 and the described superbright degree of timing control signal; Microcontroller 3 is according to step S24: judge whether superbright degree control signal output time reaches default superbright degree control signal output time; If reach default output time, then enter step S25: stop to export superbright degree control signal, but continue the output brightness control signal; If do not reach default output time, then turn step S23.
Fig. 4 has the circuit block diagram of second embodiment of the electronic installation of LED brilliance control function for the present invention.Because the circuit block diagram of second embodiment is similar to embodiment one, historical facts or anecdotes is executed mode two and only newly-increased assembly is described, and the same composition assembly is repeated no more.As shown in Figure 4, the microcontroller 3 of described electronic installation 200 further includes a counter 32, and microcontroller 3 is by the number of times of described superbright degree control signal output in these counter 32 counting setting-up time scopes.For example, setting the number of times that described superbright degree control signal HL exports in 24 hours is 10 times.Accordingly, storer 50 is also stored the default output number of times of superbright degree control signal in the setting-up time.When described microcontroller 3 is exported described superbright degree control signal HL at need, judge that whether the number of times of described superbright degree control signal HL output in the setting-up time is greater than default output number of times, when the number of times of described superbright degree control signal HL output in the setting-up time is exported described superbright degree control signal HL during less than default output number of times, it is luminous to control these LED matrix 6 superbright degree, otherwise do not export described superbright degree control signal HL, LED matrix 6 is normally luminous.
See also Fig. 5.Fig. 5 is the brilliance control process flow diagram of electronic installation 200 shown in Figure 4.Microcontroller 3 detects when using signal, uses the brightness of signal controlling LED matrix 6 according to this.Control method comprises: step S41: judge whether to detect one and use signal; If do not detect the use signal, then continue to detect and use signal; Use signal if detect one, then enter step S42: whether the unused time of judging record reaches default unused time, if do not reach default unused time, then enters step S48: export described normal brightness control signal BL; If reach default unused time, then enter step S43: judge whether described superbright degree control signal output number of times reaches default output number of times in the setting-up time, then enter step S48 if reach default output number of times; Then do not enter step S44 if reach default output number of times: export described normal brightness control signal BL and described superbright degree control signal HL to the output time of pulse current control module 4 and the described superbright degree of timing control signal; Microcontroller 3 is according to step S45: judge whether described superbright degree control signal HL output time reaches default superbright degree control signal output time; If reach default output time, then enter step S46: stop to export described superbright degree control signal HL, but continue the described normal brightness control signal BL of output; If do not reach default output time, then turn step S44; Step S47: rolling counters forward adds 1.
In sum, described electronic installation and control method with LED brilliance control function, when detecting the use signal, the superbright degree is luminous in the control electronic installation certain hour, and control the luminous number of times of superbright degree in Preset Time, thereby do not influence the serviceable life of electronic installation.
Claims (11)
1. the electronic installation with LED brilliance control function comprises: a power supply, for the electric energy that described electronic installation work is provided; One signal generation unit uses signal for generation of one; One microcontroller is used for output one normal brightness control signal; One pulse current control module is used for the electric current according to described normal brightness control signal control output; And a LED matrix is used for luminous according to described electric current normal brightness; It is characterized in that, this electronic installation also comprises a storer, this storer is used for storage one default superbright degree control signal output time and a default unused time, described microcontroller also comprises a timer, the unused time that continues not receive the use signal of signal generation unit generation when using signal by described timer record that described microcontroller is receiving that the signal generation unit produces, when the unused time of described use signal equals or exceeds a default unused time, when exporting described normal brightness control signal, exports by this microcontroller a superbright degree control signal, described pulse current control module makes that according to described normal brightness control signal and described superbright degree control signal control output current this LED matrix superbright degree is luminous; This microcontroller is also by the described superbright degree of this timer timing control signal output time, when described superbright degree control signal output time reaches default superbright degree control signal output time, described microcontroller stops to export described superbright degree control signal, continues the described normal brightness control signal of output.
2. electronic installation as claimed in claim 1, it is characterized in that, described microcontroller also comprises a counter, described counter is used for described superbright degree control signal output number of times in counting one setting-up time, and it is the default output number of times that does not reach superbright degree control signal in the setting-up time for described superbright degree control signal output number of times that described microcontroller is exported described superbright degree control signal.
3. electronic installation as claimed in claim 1 is characterized in that, described superbright degree control signal is a high level signal.
4. electronic installation as claimed in claim 1 is characterized in that, described superbright degree control signal is a pwm signal.
5. electronic installation as claimed in claim 1, it is characterized in that, described electronic installation also comprises the feedback resistance (R9) that is connected in series with described LED matrix, described pulse current control module comprises: one first switch element, a DC-DC voltage boosting translation circuit, a second switch unit and first resistance (R8), and described first switch element, DC-DC voltage boosting translation circuit, second switch unit connect successively; When described first switch element and described second switch cell conduction, described first resistance (R8) is connected in parallel with described feedback resistance (R9).
6. electronic installation as claimed in claim 5, it is characterized in that, described first switch element comprises: a field effect transistor (Q1) and a triode (Q2), the source electrode of described field effect transistor (Q1) links to each other with described power supply, drain electrode links to each other with described DC-DC voltage boosting translation circuit, and grid is electrically connected on the collector of described triode (Q2); The emitter of described triode (Q2) is electrically connected on power supply ground, and grid is connected in described emitter, the conducting that the grid that described brightness control signal is sent to described triode (Q2) is controlled described triode (Q2) with end; When described triode (Q2) conducting, the voltage of the grid of described field effect transistor (Q1) reduces, and makes the gate source voltage reverse bias of described field effect transistor (Q1), described field effect transistor (Q1) conducting.
7. electronic installation as claimed in claim 6, it is characterized in that, described DC-DC voltage boosting translation circuit comprises: a DC-DC voltage boosting converter (U1), one inductance (L1) and a rectifier (D1), described DC-DC voltage boosting converter (U1) comprises that an operating voltage end and an Enable Pin are electrically connected on the drain electrode of described field effect transistor (Q1) respectively, described DC-DC voltage boosting converter U1 further comprises a power switch output terminal, one overvoltage protection end and a feedback input end, described power switch output terminal is connected in the positive pole of described inductance (L1) and described rectifier (D1); The other end of described inductance (L1) is electrically connected on the operating voltage end of described DC-DC voltage boosting converter (U1); The negative electricity of described rectifier (D1) is connected in the input end of described LED matrix; Described overvoltage protection end is electrically connected on the negative pole of described rectifier (D1), and the feedback input end of described DC-DC voltage boosting converter (U1) is electrically connected between the output terminal and described feedback resistance (R9) of described LED matrix.
8. electronic installation as claimed in claim 5 is characterized in that, described second switch unit comprises field effect transistor (Q3), and the grid of described field effect transistor (Q3) is electrically connected on ground; The source electrode of described field effect transistor (Q3) is electrically connected on ground, and the drain electrode of described field effect transistor (Q3) is electrically connected between the output terminal and described feedback resistance (R9) of described LED matrix through described first resistance (R8); The grid of described field effect transistor (Q3) receives the superbright degree control signal of described microcontroller output, controls the conducting of described field effect transistor (Q3) and ends.
9. the brightness control method of an electronic installation is characterized in that described method comprises:
Judge whether to receive one and use signal;
Use signal when receiving one, record continues not receive the unused time of the use signal of signal generation unit generation; When if the unused time of described use signal equals or exceeds a default unused time, export a normal brightness control signal and a superbright degree control signal, and the output time of the described superbright degree of timing control signal; And
Judge whether superbright degree control signal output time reaches default superbright degree control signal output time; If reach default superbright degree control signal output time, then stop to export described superbright degree control signal, but continue output normal brightness control signal; If do not reach default output time, then continue the described normal brightness control signal of output and superbright degree control signal.
10. control method as claimed in claim 9, it is characterized in that, described receiving exported a superbright degree control signal step when exporting described normal brightness control signal when using signal and comprised: judge whether superbright degree control signal output number of times reaches default superbright degree control signal in the setting-up time and export number of times, if do not reach described default superbright degree control signal output number of times, then export described normal brightness control signal and described superbright degree control signal.
11. control method as claimed in claim 10 is characterized in that, described method comprises: when exporting described superbright degree control signal, superbright degree control signal output number of times in this setting-up time is added 1.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100661564A CN101541117B (en) | 2008-03-21 | 2008-03-21 | Electronic device with function of LED illumination control and control method thereof |
| US12/406,054 US8111007B2 (en) | 2008-03-21 | 2009-03-17 | Electronic device capable of controlling LED brightness and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100661564A CN101541117B (en) | 2008-03-21 | 2008-03-21 | Electronic device with function of LED illumination control and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101541117A CN101541117A (en) | 2009-09-23 |
| CN101541117B true CN101541117B (en) | 2013-07-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008100661564A Expired - Fee Related CN101541117B (en) | 2008-03-21 | 2008-03-21 | Electronic device with function of LED illumination control and control method thereof |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US8111007B2 (en) |
| CN (1) | CN101541117B (en) |
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| US20120038293A1 (en) * | 2010-02-16 | 2012-02-16 | Salvatore Guerrieri | LED Lighting Device |
| TWI445444B (en) * | 2011-09-27 | 2014-07-11 | Hannstar Display Corp | Led driving circuit |
| CN102591118A (en) * | 2011-12-15 | 2012-07-18 | 四川长虹电器股份有限公司 | Device and method for protecting light-emitting diode (LED) light source used by projector |
| JP5969109B2 (en) | 2012-03-29 | 2016-08-10 | インテル コーポレイション | Magnetic state element and circuit |
| EP2648482A1 (en) * | 2012-04-05 | 2013-10-09 | Koninklijke Philips N.V. | LED lighting system |
| US8988340B2 (en) * | 2013-03-16 | 2015-03-24 | VIZIO Inc. | Controlling color and white temperature in an LCD display modulating supply current frequency |
| KR102071004B1 (en) * | 2013-09-03 | 2020-01-30 | 삼성디스플레이 주식회사 | Dc-dc converter and organic light emitting display including the same |
| CN107105542B (en) * | 2013-09-29 | 2018-12-28 | 赛尔富电子有限公司 | A kind of under-voltage protecting circuit for LED lamp |
| CN106601194A (en) * | 2016-12-19 | 2017-04-26 | 珠海市魅族科技有限公司 | LCD brightness adjusting method and device |
| CN112233627B (en) * | 2020-12-14 | 2021-04-20 | 北京显芯科技有限公司 | Control method of backlight circuit, backlight circuit and LCD display screen |
| CN114867152B (en) * | 2022-04-22 | 2025-03-25 | 佛山市锐霸电子有限公司 | A shunt circuit for controlling the current of LED lamp through PWM signal |
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| CN2530283Y (en) * | 2001-08-24 | 2003-01-08 | 毛宏建 | Remote controlled hanging and multifunctional computerized permanent calendar |
| CN2685990Y (en) * | 2004-02-06 | 2005-03-16 | 林上港 | Remote-control and hand-control multi-purpose indoor digital display timing instrument |
| CN200996578Y (en) * | 2006-09-28 | 2007-12-26 | 南京汉德森科技股份有限公司 | Large-power LED stage light |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4052998B2 (en) * | 2003-11-25 | 2008-02-27 | シャープ株式会社 | Power supply circuit and electronic device using the same |
| US7276861B1 (en) * | 2004-09-21 | 2007-10-02 | Exclara, Inc. | System and method for driving LED |
| US7259525B2 (en) * | 2005-11-03 | 2007-08-21 | System General Corporation | High efficiency switching LED driver |
| JP4207986B2 (en) * | 2006-06-28 | 2009-01-14 | 双葉電子工業株式会社 | Fluorescent display device and driving method thereof |
| US7528555B2 (en) * | 2007-08-01 | 2009-05-05 | Micrel, Inc. | LED controller IC using only one pin to dim and set a maximum LED current |
| US7956554B2 (en) * | 2007-09-21 | 2011-06-07 | Exclara, Inc. | System and method for regulation of solid state lighting |
-
2008
- 2008-03-21 CN CN2008100661564A patent/CN101541117B/en not_active Expired - Fee Related
-
2009
- 2009-03-17 US US12/406,054 patent/US8111007B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2530283Y (en) * | 2001-08-24 | 2003-01-08 | 毛宏建 | Remote controlled hanging and multifunctional computerized permanent calendar |
| CN2685990Y (en) * | 2004-02-06 | 2005-03-16 | 林上港 | Remote-control and hand-control multi-purpose indoor digital display timing instrument |
| CN200996578Y (en) * | 2006-09-28 | 2007-12-26 | 南京汉德森科技股份有限公司 | Large-power LED stage light |
Also Published As
| Publication number | Publication date |
|---|---|
| US20090237005A1 (en) | 2009-09-24 |
| US8111007B2 (en) | 2012-02-07 |
| CN101541117A (en) | 2009-09-23 |
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